24 ships sunk with a total of 69,016 tons.2 ships damaged with a total of 6,714 tons.1 ship taken as prize with a total of 1,005 tons.1 ship damaged with a total of 5,250 tons.
(View ships hit by U 66)

Fate

3 Sep 1917 - Lost on or after September 3, 1917, possibly in the Dogger Bank area to a mine. 40 dead (all hands lost).